Journal Article

Proton, deuteron and triton flow measurements in Au+Au collisions at sNN=2.4 GeV

Lalik, R., Sobolev, Yu. G., Michel, J., Ramos, S., Malige, A., Piasecki, K., Singh, U., Spies, S., Kunz, T., Schwab, E., Sellheim, P., Wendisch, C., Harabasz, S., Kardan, B., Pechenov, V., Rathod, N., Scheib, T., Schuldes, H., Wirth, J., Kolb, B. W., Korcyl, G., Pysz, K., Bordalo, P., Lorenz, M., Silva, L., Siebenson, J., Galatyuk, T., Scozzi, F., Friese, J., Garzón, J. A., Szala, M., Kämpfer, B., Koenig, W., Rost, A., Maurus, S., Kornas, F., Smyrski, J., Chlad, L., Pechenova, O., Kugler, A., Berger-Chen, J. C., Kotte, R., Arnold, O., Mahmoud, T., Selyuzhenkov, I., Franco, C., Parpottas, Y., Hlavac, S., Höhne, C., Ciepal, I., Maier, L., Holzmann, R., Münzer, R., Rodriguez-Ramos, P., Fabbietti, L., Dreyer, J., Adamczewski-Musch, J., Sturm, C., Heinz, T., Nowakowski, K., Kohls, M., Naumann, L., Behnke, C., Ramstein, B., Traxler, M., Belounnas, A., Lopes, L., Wójcik, D., Stroth, J., Epple, E., Gumberidze, M., Spataro, S., Lapidus, K., Wiebusch, M. G., Greifenhagen, R., Hennino, T., Matulewicz, T., Mihaylov, D. M., Böhmer, M., Filip, P., Przygoda, W., Mangiarotti, A., Zumbruch, P., Seck, F., Svoboda, O., Fröhlich, I., Rosier, P., Tsertos, H., Wagner, V., Pietraszk

2023

Overview

High-precision measurements of flow coefficients v n ( n = 1 - 4 ) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at s NN = 2.4  GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at the SIS18/GSI. Flow coefficients are studied as a function of transverse momentum p t and rapidity y cm over a large region of phase-space and for several classes of collision centrality. A clear mass hierarchy, as expected by relativistic hydrodynamics, is found for the slope of v 1 , d v 1 / d y ′ | y ′ = 0 where y ′ is the scaled rapidity, and for v 2 at mid-rapidity. Scaling with the number of nucleons is observed for the p t  dependence of v 2 and v 4 at mid-rapidity, which is indicative for nuclear coalescence as the main process responsible for light nuclei formation. v 2 is found to scale with the initial eccentricity ⟨ ϵ 2 ⟩ , while v 4 scales with ⟨ ϵ 2 ⟩ 2 and ⟨ ϵ 4 ⟩ . The multi-differential high-precision data on v 1 , v 2 , v 3 , and v 4 provides important constraints on the equation-of-state of compressed baryonic matter.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Charged particles / Coalescence / Collisions / Deuterons / Flow coefficients / Flow measurement / Hadrons / Heavy Ions / Hydrodynamics / Magnetic fields / Nuclear Fusion / Nuclear Physics / Particle and Nuclear Physics / Physics / Physics and Astronomy / Protons / Regular Article - Experimental Physics / Sensors / Transverse momentum / Tritons / Viscosity